Ii8 Rhodora 



[June 



descending rhizoidal filaments are not uncommon, but the matting 

 together of the fronds is due more to the peculiar hooked branches. 



From Can-fa, under which it is included by most authors, it differs 

 by the acute hooked branches, shorter joints', and the less fastigiate 

 character of the frond. This last character, though apparently con- 

 stant in American specimens, is not uniform in European forms, 

 some of them being reported as quite level topped. In C. a/r/a, 

 except in older stages, the fiat or rounded top of the frond is very 

 noticeable, while the American C. spmescens t even in the younger 

 stages, has more the form of rope-like, many times branched fronds ; 

 somewhat like Ectoearpus tomentosus. C. arcta is a plant of early 

 spring, and grows on rocks ; C. spinescent is nearly always epiphytic. 

 and is in excellent condition in July, when only battered forma of 

 C. an/a are to be found. 



It has been collected by the writer at Nahant, Mass., at St. 

 George's Bay, at Pemaquid, and at Mt. Desert, Maine. 

 C. i.anosa (Roth) Kiitz. 



Kiltzing, Phyc. Gen., p. 269. 



Harvey, Phyc. Brit., PI. VI ; Nereis Bor.-Am., part 3, p. 76. 



Le Jolis, Alg. Mar. Cherb., p. 63. 



Farlow, N. K. Marine Algae, p. 51. 



Hauck, Deutsch, Meeresalg.. p. 447. 



I)e Toni, Syll. Alg., Vol. I, p. 336. 



Hauck & Richter, Phyc. Univ., No. 276. 



Collins, Holden & Setchell., Phyc. Bor.-Am., No. 661. 



Farlow, Anderson & Eaton. Alg. Am.-Bor. Exsicc, No. 204. 



Conferva favosa Roth, Cat. Bot., Vol. Ill, p. 291. 



Filaments 30-40 p. diam., light green, cells 2-6 diam. Fronds fasti- ' 

 giate, branches erect, blunt, more or less matted at the base by 

 descending rhizoidal filaments, slightly smaller than the main fila- 

 ments. Epiphytic on various algae. 



This species is quite distinct, and has been maintained unchanged 

 since its establishment in 1806. It is found along the whole New 

 England coast. It appears in April, is in good condition in May 

 and June ; in the latter part of June and in July the fronds become 

 detached, and float ashore in the form of soft, round, pale green 

 tassels, two or three centimeters in diameter. 



C. i.anosa var. unci ai, is (Fl. Dan.) Thuret. 

 Thuret in Le Jolis. Alg. Mar. Cherb., p. 63. 

 Farlow, N. E. Marine Algae, p. 51. 

 Hauck, Deutsch. Meeresalg., p. 447. 

 De Toni, Syll. Alg., Vol. I, p. 336. 

 Collins, Holden & Setchell, Phyc. Bor.-Am., No. 77. 

 C. utuialis Harvey, Phyc. Brit., PI. CCVII ; Nereis Bor.-Am., 



part 3, p. 77. 

 Conferva uncialis Fl, Dan., PI. DCCLXXI, iv^. I. 



